The ZnO nanowires were synthesized by using vapor–liquid–solid mechanism and then the ZnO nanowires were sheathed with TiO2 by metal organic chemical vapor deposition. The coaxial nanowires were 30–200 nm in diameter and up to 0.2 μm in length.
Transmission electron microscopy and X-ray diffraction analysis results showed that the ZnO cores and TiO2 shells of the core–shell nanowires had wurtzite and amorphous structures, respectively. Photoluminescence measurement showed that TiO2 coating increased and
decreased the near-band edge (NBE) and deep-level emissions of the ZnO nanowires in intensity, respectively. However, it appeared that subsequent annealing was undesirable since it decreased the NBE emission in intensity.

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